Seems you just can't keep too many extra parts around. These little q/s pin locks seem to be one of the most frequent lost on Spyder markers. Without one of these it's most assured the q/s pin is going to fall out and after that the rest of the internals. Lost yours? Order a new one here and get a couple extras as back up just in case.
This is a replacement for Kingman part #23C in your manual.
